Manufacturer's Requirements ...
(k) To electronically list and maintain an up‐to‐date electronic FDA registration and listing of all NDCs of the Manufacturer, including the timely removal of discontinued NDCs from the FDA NDC Directory, so that CMS and Part D sponsors can accurately identify applicable drugs (as defined in section I (c) of this Agreement).
Medicare Coverage Gap Discount Program Manufacturer Agreement
SPL R4 & CMS Memo ‐
Medicare Coverage Gap Discount Program Manufacturer Agreement
https://www.cms.gov/PrescriptionDrugCovGenIn/Downloads/ManuAgreement.pdf
Manufacturer's Requirements ...
(k) To electronically list and maintain an up‐to‐date electronic FDA registration and listing of all NDCs of the Manufacturer, including the timely removal of discontinued NDCs from the FDA NDC Directory, so that CMS and Part D sponsors can accurately identify applicable drugs (as defined in section I (c) of this Agreement).
Medication Coverage Gap Discount Program - 2011 List of Manufacturers: http://www.cms.gov/PrescriptionDrugCovGenIn/Downloads/2011LabelerCodeFileApril.zip